Method of evaluating power storage device, method of manufacturing power storage device, and test system

Abstract

A method of evaluating a power storage device includes at least [a] to [f] below. [a] A power storage device is prepared. [b] A charge level of the power storage device is adjusted to produce a first potential difference between a positive electrode and a negative electrode. [c] The positive electrode or the negative electrode is selected as a reference electrode. [d] After the charge level is adjusted, an operation to insert a conductive rod-shaped member into a stack portion along a direction of stack of the positive electrode and the negative electrode is performed while a second potential difference between the reference electrode and the rod-shaped member is measured. [e] The rod-shaped member is stopped. [f] The power storage device is evaluated based on a state of the power storage device after the rod-shaped member is stopped.

What is claimed is: 
     
       1. A method of evaluating a power storage device comprising:
 (a) preparing a power storage device including an electrode assembly that includes a positive electrode and a negative electrode; 
 (b) adjusting a state of charge of the power storage device; 
 (c) selecting the positive electrode or the negative electrode as a reference electrode; 
 (d) performing an operation to insert a conductive rod-shaped member into the electrode assembly while a potential difference between the reference electrode and the rod-shaped member is measured after the state of charge is adjusted; 
 (e) stopping the rod-shaped member such that a short-circuiting stops at the short-circuiting between one layer of the positive electrode and one layer of the negative electrode by monitoring a variation of the potential difference; and 
 (f) evaluating the power storage device by monitoring a state of the power storage device after the short-circuiting.